Yes, innovation is good for society at large. No, most people who read /. probably don't feel to bad when an established business is upset by a disruptive new company. Yes, change is good in the economy, as it keeps companies innovating. No it isn't good that a lot of people are going to lose their jobs.
But, this is particularly disturbing because driving a taxi is a hard problem to automate, and if this can be done, then it puts a timer on a lot of manual labor that people at the bottom of the financial ladder depend on to get by. Society in its current form cannot survive with 50% of the population perpetually impoverished and unemployed. There is a saying that a country is only ever meals away from revolution, and either we need to become a lot more generous with social entitlements, or cities will burn, and it will be France 1793 all over again.
The only real question is when? Based on social and technological change, I am guessing in no less that 20 years, but no more than 50 years.